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density
It means; Density equals pressure
inches,volume,temp,mass,density,time
While a pound is a measurement of weight, a quart is a measurement of volume. The density and size of an item would be needed to find the weight of a specific volume.
Density is measure as mass/volume. As with any matter, the density of chalk would require: 1. a measurement of its mass 2. a measurement for its volume. Mass can be measures on a scale in kg. Chalk's shape also makes it calculable for volume (in metres). If it is cylindrical, measure the height and the radius, then solve for V = (pi)(r^2)h. Divide the mass by that volume and find its density in kg/m^3.